Hydraulic lift



May 29, 1928. 1,671,193

F. KOENIGKRAMER HYDRAULIC LIFT 4 Filed Sept. 24, 1926 Patented May 29, 1928.

' UNITED STATES i V1,671,193 PATENT-onion.

FRANK KOENIGKRAMER, OF CINCINNATI, CHIC.

HYDRAULIC LIFT.

Appncation'led september 24 1926. semaine. 137,595.

lever is resiliently energized to move upwardly so that upon the operator reciprocally actuating the lever to elevate the plunger, it is only necessary for him to successively depress the lever.l allowing the lever to be automatically and resiliently moved in the opposite direction or upwardly. Another object is to provide, in connection with the actuating mechanism, improved locking means which is resiliently energized to automatically unlock the plunger from its cylinder and to restore and hold the locking member uniformly, automatically, and reliably in its initial or idle position ready to be put into'operation when required.

My invention also comprises certain details of form andarrangement, and combinationof components,all of which will be fully set forth in the description of the accompanying drawings, in which:`

Fig. 1 is a plan view of av hydraulic lifting apparatus embodying my improvements.

Fig. 2 is a central vertical section through the same, taken on line 2 2 of Fig. 1.

Fig. 3 is a side elevation of the plunger detached from the cylinder.

Fig. 4 is a perspective view of the locking shoe detached.

Fig. `5 is a perspective detail of a portion of the plunger and locking barl actuating mechanism detached.

Fig. y6 is a perspective viewot` the upper end of the plunger rod. Y

Fig. 7 is a perspective view of a bolt employed to Yresiliently return the locking bar to initial or idle position.

The accompanying drawings illustrate the preferred embodiment of my invention in which 15 represents the cylinder of a hydraulic lift, and is adapted to be mounted rigidly upon the base of a barber chair for -instance while the plunger 16 is supported within the cylinder and is verticaly adjustable relative to the cylinder by manually lever l17.

tion of adjustment.

actuating a lever 17, whereby a Huid is adapted to be forced from a reservoir 18 within the plunger into the space between the end ofthe plunger and the end ofthe cylinder, or returned from the space between the end of the plunger and the end of the cylinder, into said reservoir, depending upon the position and manner of actuating the j The actuating lever 17 is bent at right angles at 19 near the upper end of the plunger and the horizontal section thereof is journaled in a bearing 20 formed in the upper end of the plunger. Inside of the bearing 2O is a head 2 1 which is rigidly attached to the inner end of the lever 17 by means of a set screw 22. The head 21y is provided with a crank pin 24 by means of which the pump plunger may be reciprocated and with a projection or tooth 25 which is adapted to engage a recess inthe upper end of a locking b ar to positively lock the plunger to its adjusted position relative to the cylinder. j

The side walls of the plunger are perforated to receive and support a cylindrical locking shoe 30 which is adapted to be thrust endwise against the inner face of the cylinder wall so as to rigidly and frictionally or mechanically lock the plungerin place relative to the cylinder at any desired osi- This is effected) `by means ofa locking bar 31 which extends downwardly 'along the inside of the plunger wall and at its lower end is provided with -a tapered or wedge shaped section 32 which entends through a perforation 33 in the locking shoe so that vwhen the locking bar 31 is thrust downwardly this wedge-shaped section is forced between the innerfwall of the plunger and the inner end of the recess 33 and forces the shoe 30 in a right hand direction with its right hand end in frictional engagement with the inner ywall of the cylinder, and' the plunger' and cylinder locked together. plunger-is: a slot- 34 through which projects the shank of abolt 36 the inner end 37f0f which is threaded into a recess in the upper end of the locking bar 3-1. The head 38 of the bolt 36 is provided with a downwardly directed cylindrical projection 39, the lower end of which passes through and is laterally supported by a perforation through a projection 40 extending outwardlyfrom the upper end of the plunger.` A

At the upper end of thev coiled springil is mounted upon the rod 39 between the head 38 and the projection 40 and serves to automatically litt the bar 31, and retract it fro-in locking 'engagement "tiveY to, the cylinder. lowerl the. plunger relative to the cylinder with the shoe 30, and to normally hold the bar 31 in its initial or id le. position. initial or idle position ot the lever 17 is substantially vertical as shown in Figs; 2 and 3. When` lever 17 is shifted toward the left hand Fig. 2, the tooth. 25 comes into engagement with the lower face of a recess 43 in the upper end off the bar 331 and serves to' thrust the bar 31 downwardly and lock the plunger and cylinder together retaine ing; the tooth 25 in the recess 43'. When the operator wishes to unlock the plunger from v the cylinder he restores the lever 17 toits initial or vertical position which results in the toothy 25 engaging the upper wall of the recess 43 and lifting the bar 31 suiiiciently to release the tooth 25l from recess 43,

and to thereby release the shoe 30 from the cylinder warlil The spring 41 completes and insuresV the return `and hold-ing: oi' the bar 31 in its: initial or idle position until again required. tof look the plunger tothe cylinder.

Alt the upper enefot the pumpY rod. 44, is a heard 45 which is rig-idly attached by a set screw 46- to: the end et the pump rod, and which isprovidedwitlr a journal bearing 47 to engage thel cra-nit piny Q4 by means o which the pump rod may be reciprocated endwise through a reciprocal movement of the lever 17, preferably by moving; the lever 117 for a short distance in ai right hand direction from the vertical position shown in Fig; Ato nearly ai horizontal position. The

pump; rod: passes loosely through a washer orcolla'r` 50resting; upon and above the lockingl shoe' 30, and through a perforation 51 `im the shoe 30 At the lower end ot the pumps rodi and below they shoe `30 a` pump pistonn 52' is rigidly attached? to the pump frodvbya pin 53.` TheA pump.` piston: is pro vided with `a spring ac-tua'ted pump valve 54 serving to close a port 55 through the pump piston, and which valve and port are arranged so as to automatically feed the fluid inthe interior of the plunger downwandly past the pump piston whenthe pumpfpiston is reciprocated within prescribed limits. A port 56.1y through the bottom of the plungerl 16 and a. spring actuatedz valve 57 provide forI the fluid being forced by the pump piston through the port inte-the spacefbetweenthe lower end of thefplunger and the lower end of the cyl- `'inde-r. ltd-thereby elevate the plunger rela- Vhen it isf desired to the handle ot the lever 17 is depressed toward the right hand in Fig. 2 to a still tur-,ther degree thany that. employedy for pumping purposes, say vbelow a horizontal position, which results in bringing the by-pass port 58 past the piston into the upper portion. ci the interior ot the plunger 17 and allowing the plunger to move downwardly relative to the cylinder.

Outside of the plunger bearing 20 is a collar 59 rigidly held to its adjusted position upon the lever'17 by'means of a set screw 60. Thel col-lar 59 prevents play of vthe lever 17 eirdwise in the bearing 20.. The collar 59 is provided with aiprojection 62 which overlrangs the bearing 20 and is in a position to engage a projection 63 extending out wardly from `the bearing 2O to limit the movement of the lever 17 and prevent the locking. bar 31 being unduly forced into en'- gagement with the shoe 30. Mounted upon the pump rod 44. is a collar 64 held rigidly in place thereon. by a set screw G5. A coiled spring 66 is interposed between the collar 64 and the collar 5.0, which serves t-o automaticalily lift the pump rod 44 and to return the handlever 17 to a vertical position, which is its initial or idle position, and to retain' the hand lever 17. inthis position unator knows exactly where to find the lever Awhen required` without havingtto look for it, and is enabledA to release the lever in any position knowing. that it will automatically returnn `to itsy initial position.

The spring 41 and bolt 36 serve to guide the-bar 31` andto return the locking bar 31 to itselevatedposition as shown inFig. Zas soon as the lever 17 has returned to its initia=l position, thereby entirely releasing the bar 31 fromloeking relation tot the shoe 30 and placing the recess 43 ofA the bar 31 in positionY to'fbe engagedl by the tooth 25 with certainty andA reliability. Y

A chair seat, bac-lr, armsand toot rest are adapted to-be attached-.to the upper end of the plunger and to be vertically therewith.y i

AThe v app arat-us herein i shown i and described is capable ot considerable modiiicationwithin the scope of the claims without departing `adjusted iis acting resiliently to return said locking bar to its initial idle position, a pump piston located in said plunger and adapted to force a liquid from the interior of said plunger into the space between the bottom of said plunger and the bottoml of said cylinder.

2. A hydraulic lift comprising a cylinder, a plunger' mounted therein to move vertically within the cylinder, a locking shoe supported near opposite ends in bearings carried by said plunger and adapted to move endwise into and out of engagement with the inner tace of said cylinder to frictional ly engage and lock said plunger to said cylinder, a locking bar having a tapered section to engage said shoe and force the shoe into engagement with the cylinder wall, means acting resiliently to return said locking bar to its initial idle position, a pump piston located in said plunger and adapted to force a liquid from the interior of said plunger into the space between the bottom of said plunger and the bottom of said cylinder` a piston rod passing through a peroration in said shoe and connected at one end to said piston and at its opposite end to the crank pin of an actuating lever.- a collar rigid upon said piston rod, a collar loose upon said piston rod andvresting upon said shoe, and a spring interposed between said collars to resiliently act upon said piston rod and actuating lever .to return them automatically to a predetermined idle position.

3. A hydraulic lift comprising a cylinder, a plunger mounted therein to move vertically within the cylinder, a piston located within said plunger, and adapted to force a liquid from the interior of said plunger into the space between said plunger and the bottom of said cylinder, an actuating lever journaled to said plunger and provided with a crank pin to actuate said piston, a piston rod connected at its lower end to said piston and at its upper end to the crank pin of said actuating lever, and a spring acting resiliently upon said piston rod and actuating lever to automatically hold said piston rod and actuating lever in a predetermined idle position. y

In testimony whereof I have aiiixed my signature.

FRANK KOENIGKRAMERI 

